For example, you cannot rename a file with adopteesofcolor.org extension to adopteesofcolor.org and make If you want to change the file type, you need to convert the file. MultiDoc Converter is a Freeware software to convert multiple documents between Word, OpenOffice, PDF and many more. If you know that you'll want to access a given file using multiple programs, you can save the file in several formats to begin with. Of course, you. on CMD. type ren *.* *.jpg. will select all files, and rename to * (what ever name they have) plus extension to jpg Rename multiple file extensions: You want to. This page shows you how to change file extension for multiple files in one folder at once, with the CMD window in Windows Download Bulk Extension Changer for free. Simple tool to change file extensions. This simple tool allows you to change the extensions of files. File conversion software to convert audio, video, image and ofther document file is a multi format document file converter that is very easy to use for converting. Handy if someone gives you a bunch of files with no extension. Author avatar So how do you rename multiple file extensions at once?. Right now it can convert between image/photo files in the following formats: BMP, EPS, GIF, HEIC, ICO, JPG, ODD, PNG, PS, PSD, Popular File Conversions.